Before we got a dog, I read about how playing tug of war wasn't good because it makes dogs more aggressive. I don't know how I feel about that. I think tug of war can be a fun game as long as you can put boundaries on it when you're playing. I play tug of war with Oscar once in a while. I keep the games short and if he starts getting really excited, we stop. He has fun, and doesn't seem to get aggressive after playing. It's good, clean fun for us!